docs: def render(network,
             style=DEF_STYLE,
             layout_algorithm=DEF_LAYOUT,
             background=DEF_BACKGROUND_COLOR,
             height=DEF_HEIGHT,
             width=DEF_WIDTH,
             style_file=STYLE_FILE,
             def_nodes=DEF_NODES,
             def_edges=DEF_EDGES):
      """Render network data with embedded Cytoscape.js widget.
  
      :param network: dict (required)
          The network data should be in Cytoscape.js JSON format.
      :param style: str or dict
          If str, pick one of the preset style. [default: 'default']
          If dict, it should be Cytoscape.js style CSS object
      :param layout_algorithm: str
          Name of Cytoscape.js layout algorithm
      :param background: str
          Background in CSS format
      :param height: int
          Height of the widget.
      :param width: int
          Width of the widget.
      :param style_file: a styles file. [default: 'default_style.json']
      :param def_nodes: default: [
      {'data': {'id': 'Network Data'}},
      {'data': {'id': 'Empty'}} ]
      :param def_edges: default: [ {'data': {'id': 'is', 'source': 'Network Data', 'target': 'Empty'}} ]
      """
  
      from jinja2 import Template
      from IPython.core.display import display, HTML
  
      STYLES=set_styles(style_file)
  
      # Load style file if none available
      if isinstance(style, str):
          # Specified by name
          style = STYLES[style]
  
      if network is None:
          nodes = def_nodes
          edges = def_edges
      else:
          nodes = network['elements']['nodes']
          edges = network['elements']['edges']
  
      path = os.path.abspath(os.path.dirname(__file__)) + '/' + HTML_TEMPLATE_FILE
      template = Template(open(path).read())
      cyjs_widget = template.render(
          nodes=json.dumps(nodes),
          edges=json.dumps(edges),
          background=background,
          uuid="cy" + str(uuid.uuid4()),
          widget_width=str(width),
          widget_height=str(height),
          layout=layout_algorithm,
          style_json=json.dumps(style)
      )
  
      display(HTML(cyjs_widget))